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    <title>Document</title>
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    <audio controls src="/HTML/audios/bgm.mp3"></audio>
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    <video controls src="/HTML/videos/video1.mp4" width="300"></video>
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        <source src="/HTML/audios/sound2.mp3" type="audio/mpeg">
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    <video controls width="300">
        <source src="/HTML/videos/video1.mp4" type="video/mp4">
        <source src="/HTML/videos/video2.mp4" type="video/mp4">
        sorry, no source.
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